Atoms PRETEST

The total number of protons and neutrons in an atom is called the...

• proton number
• atomic number
• mass number
• weight number

How many protons does an Aluminum atom have? (use the picture to help you)

• 27
• 13
• 14
• 40

What determines the charge of an atom?

• the atomic mass of the atom
• the number of protons and electrons
• the number of neutrons and protons
• the number of energy levels in the electron cloud

The nucleus of an atom contains 12 protons and 13 neutrons. If the atom is electrically neutral, how many electrons does this atom have?

• 13
• 12
• 14
• 20

How many neutrons does a sodium atom have? 

• 23
• 11
• 12
• 34

Atoms are broken into smaller pieces called what?

• Subatomic Particles

• Subatomic Pieces

• Quantum Particles

• Atomic Pieces

To find how many neutrons are in an atom you subtract the Atomic Number from the rounded Atomic Mass.

• True

• False

What are valence electrons?

• electrons on the first orbital always
• nucleus
• one of the shells

• the number of electrons on the outermost orbital

What charge does the nucleus have and why?

• positive - the neutrons do not have a charge
• positive - the neutrons and protons are positively charged particles
• neutral - the neutral charge dominates the positive charge
• neutral - electrons cancel out the positive charge of the atom

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 20
• 10
• 5
• 25